Back to EveryPatent.com
United States Patent | 5,028,122 |
Hamada ,   et al. | July 2, 1991 |
A liquid crystal active-matrix display device is disclosed in which the edge portion of each of the gate electrodes overlaps the edge portion of each of the picture element electrodes to form an additional capacitor. The gate electrodes are made of tantalum, and a first insulating film of tantalum pentoxide and a second insulating film of silicon nitride are disposed in a gap between each of the gate electrodes and each of the picture element electrodes. This thereby provides additional capacitors with a large capacity at a high yield, with little affect on other processes.
Inventors: | Hamada; Hiroshi (Nara, JP); Hishida; Tadanori (Nara, JP); Sakono; Ikuo (Osaka, JP) |
Assignee: | Sharp Kabushiki Kaisha (Osaka, JP) |
Appl. No.: | 340777 |
Filed: | April 20, 1989 |
Apr 20, 1988[JP] | 63-98536 |
Current U.S. Class: | 349/38; 345/92; 349/46 |
Intern'l Class: | G02F 001/13; G09G 003/02 |
Field of Search: | 350/336,333,334,339 R 340/784,719 357/4 |
3824003 | Jul., 1974 | Koda et al. | 350/333. |
4431271 | Feb., 1984 | Okubo | 350/334. |
4534623 | Aug., 1985 | Araki | 350/339. |
4778258 | Oct., 1988 | Parks et al. | 350/333. |
4810060 | Mar., 1989 | Ukai | 350/333. |
4820024 | Apr., 1989 | Nishiura | 350/333. |
Foreign Patent Documents | |||
62-10619 | Jan., 1987 | JP | 350/333. |
62-66666 | Mar., 1987 | JP | 350/333. |
"Promise and Challenge of Thin-Film Silicon Approaches to Active Matrices", Conference Record of 1982 International Display Research Conference, Cherry Hill, N.J., 19th-21st Oct., 1982, pp. 146-151. "A 640.times.400 CdSe TFT-LC Display Panel", Sid International Symbosium, Digest of Technical Papers, 1st Edition, May 1985, pp. 286-188. |